Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3347107ac9b8f5960df6982e711e2e73bd6f237345b3c3faaed4925eea98cea' 
  AND token = 'fchFVFzilLFkihK2bMinkI+cgedaOm6R3N1FQmv93IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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