Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b0e941b433437ebc0b367c0094a637b0d134638ececa1399db4c97fe6e7481' 
  AND token = 'BXR3S3iq07+ExskpLBMRZy5CW4n6x/UGLlsDe5OaPOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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