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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2dee984fefb6371c606b5bb21de8a4fbbb6574e2eee71aea6038e7a5314f336c' 
  AND token = 'rUpH5SD0OfLS5DIU4LdefjBZZ/X6X/TXGSWZSCHSFDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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