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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c601ce827fcd45cea85f5cd324ad53c8c135df98943a46cd40b8873cce6448a' 
  AND token = '5Eepp1+R2A0luLB1NtSkLKfnXCcWFYO6wb7Kj/nBVvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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