Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a400ba178f9219ebf880994b13322684710e1452429dd8cf9f92010a4af4c0' 
  AND token = 'cJO/xxWpAYXWIXiBmlk1T/OGS3E7rGFKWYTisX+795g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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