Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303601ec3ebafa991dbde929c7736af346294c6e002d80bbc7cd1217b63616c5' 
  AND token = 'KxGftcazNrhi61jEmnI4NxUQb9hoynUo8J8pil9qSaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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