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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7cbd5469a66b15e7fe8f662ec6b4e1ec50370beef663097797d5bd3548b3bca1' 
  AND token = 'XhaRYLhGY3SQHIqBjld1k1h4q+WTY4dCAY0FxHkQblI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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