Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bc152c35d762d1d5e03c947347442c8f7534be1dba1ce87e3fb86264db15a4' 
  AND token = 'g+XiqHnKY2DTfssDdcbTqbth8q73z27QUZnpMXF2jI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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