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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d9472c461e0ed56825459bb8ca6d265a05ea72992ea036cc63806ac225d2f8d' 
  AND token = '4L0N0wjFbLWTDebfy3ZlNzP7Ydds7L0XPhks70jWr1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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