Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51c0163f02a3797dccbb7e26e3dc64be8dda893ce68e061622d008593a6c102' 
  AND token = 'Zs8o6NNctlMBfMMYrGArWx6Ea+gF9G4Enf9XOwyWBog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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