Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca629307ef9d43b1549a177f57190dc0bb3e4c6525d99760eaed9dca38329e' 
  AND token = 'R4i4B0BUSheIPZWGyACqLd2PBsM3JztK9GYy1EYP0Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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