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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0aa0ef4994c4a3da1495839534e953d901a002dc2d76c2eb499af5a492154d99' 
  AND token = '/faB0tpIaZi9uOXNSbGvrDaY2FDnLtkc9q7WpUyvfSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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