Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70829171e4fb309bdf6b9a82bd8dd5ceaaaf4b75b2cf6cdb5f91ae7d4ab4849' 
  AND token = 'Y0x38UkqBupuWfrfNs6ndT28mAeopa/Fs+E+v+7yhm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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