Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502255fb7f9e9b680ba5aa9c4838b2b1065b66605acee3a083e1920428df603e' 
  AND token = 'ikWMj7cz4w7bQniaAv9ySOpS/e2wtE9EfDdvQkzMl/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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