Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc0b26211c61339dbe13785a62ca608b6653f8d36f2a8515ae6811fae28bfb6' 
  AND token = 'By/urMKlfLOGaLU8zmgawF+kDU0gMUZalQTuLR4CQts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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