Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b9c8d46927af28158741157511b6ade671eeaa607309097e83250d65381edc' 
  AND token = 'pkQ4hdjjYN3vOc03xLDFNHwv+OjNKR4WRD11ufR0/I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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