Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6c4290c91436b993fab05ac5bd6340261076b2bf4419fa1ef5a541be10d9f2' 
  AND token = '6D9UpLxqfgSfNKgXPDfjvV9epkNi/dC+/DMM+oBOoVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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