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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17fb6456795617ec5ba5a052d903879b3ae2c343504ef0867169bcfb37979b43' 
  AND token = 'EdXuJyE9LmCw10hZzOEuEwhNzmY8icwZcJ83cRTWvO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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