Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c2e867e0b3ea689abe7d890724f186f8e4b41b04adc9460a50eb326d659d4c' 
  AND token = 'LPWmZ40GPL5QoX8R+i7K+b3Q9+4isBAbcyMNSp5xdpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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