Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b024d21ebdaff434b87b80a86bd505f56143065a83f975af53825ca6b45f0ab7' 
  AND token = 'Q1YOzcggeVlFE1Qjyjwz8M71CcwHxLnC5kwW4vP1i+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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