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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28419af856473813619a2eec5a173a6fdb0f438722128f0a0206f3b4597e6cf4' 
  AND token = 'dI9I3iixKxoiGZQHT4xj3Ok1/vIoRPvxah4bSN1Cqa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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