Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff90c1b7cf8a32a0f1a33968e3fbe280da47c754f0f5b59274ef9714b9288ec5' 
  AND token = '0GVEgYNWUrc/I1SDsXvXcgyxfyJ/iqNkENOgSAtwfn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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