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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd50275c6979566cfd76d61ab0a4302dbb7ad28ccae025d52d1d6eebc4be986c1' 
  AND token = 'B0FTSwzmdEdru0SyN7MiwI+1K2Df8Cs3ZOabGEBYGvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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