Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92d8f2dad39254cce3dab5a82ef333a596f0da2a4b2fa6458d20aac38b2e4fa' 
  AND token = 'c7jbDSOM+5Pc2SzN1YgpKVKjcec7IXVYP1OuPGp+/j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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