Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37b87b1c37593bd4b6e43aaec5afd2af2b3b54d2913b288538be08278d23398' 
  AND token = 'zLoOwIauf5wac9bt3tA4hZBEI3810STz22N5dcnCTK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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