Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98d84e0fe180f0a9b18a07d5ab55128df9be88dc37f16551be6a17070f2b7ca' 
  AND token = 'GepbVYSACoNLCGrsUUKL1e6b1OEAU5iVUdzqjq9ih9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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