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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5f0a0e9a44f8b058a83e9c26505add374f7e00432583b1f536d245f26547db2' 
  AND token = 'KkViAxDdFNodP457b9U2IgRWERmWjZ+3nI+snBywE5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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