Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4659083d20d2feb43b35c4664949024d1f3c854d6a45d90ffc218e3438cdb3' 
  AND token = 'Rd6vfvBm1NaZF8f1NAnbU7mnn9YlMdRZFVT/o9Zm+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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