Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3e91283867d196619ee0c56b168ef41defcdc8ee7251daf57a342444e7c47e' 
  AND token = 'pZkaOQLF9dLUZEzCNPuqoQh026u3WpQjGX4kG4syx0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}