Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ffe531fcebe55467b2e7a0ab2c5d17c2ece6649f1afbf702769d1604546e27' 
  AND token = 'eRYJwssaMjShh7pMhySrKMx5QKWNALp16rZGnm2yOiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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