Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb64fdef67975865e69f187fc5f3548b18e5085ccf04a3564dd692657bcfb11' 
  AND token = 'rQppnu4l9bvjOZtTSX1kYtRMzxNbvztsHzNsfalvVN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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