Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c4f99ffc41f7484b60ffc21341fa6fa4d3767718169b3ae82ead5ee12e63f3' 
  AND token = 'G5qkCnKUUgtI8KgAj7YEDm0d6gloOtsVMziRKQ8OUXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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