Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9ec0cb665c8678860c2cfdb22e3b041ab23c024884bc55502b0d40b799804d' 
  AND token = 'JjsWsfJxcpvTBHFNRYlPeCgkyNc0kfIY2DTLt2L/8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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