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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be4c2525c4785ea68a080b99a44e2c0032779b6f9d901047959b93622015be81' 
  AND token = 'S3ySxWBg3qSjUqC2uxOzGsMJ7eD7KNLigrleGunJNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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