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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a21f32d2435033ae99a1b9ff196fb66cda244e3a797733ae69d14f1aa45e763d' 
  AND token = 'OlEa2VbSDQfoBt92ERV6TTGqPhBLQh7+Y9gsXBpOVNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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