Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af53ac38c2ea98943309baf5d98bf1469c11ea9f0b63df77e9ece69fb5ad3bc3' 
  AND token = 'vZ/7CIxFldnidUFk4gZIYugHYHkYM8tFWUqJRZzWekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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