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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ebc4556431a2c3fa00bac1f260ee5fea90d2089851a71e8b56c65cc6c018019' 
  AND token = 'Ubqwni4jJ/rwgCEzc5BhZyA1jsvE4N/TWGer0aYVeaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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