Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22fc21d8bd715398348d8618867b0717b1fce83c6cf5cdfed49f43d4f87f3a8' 
  AND token = 'SOlk4IbbhaE5T/Qhxdt7R8WBjeJvngxq8+QoLSQFBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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