Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8199e7072630bb44d12e451136ecba9d8f68155839585615ffb3375e089b866' 
  AND token = 'xe5w9RmCTGnk3RbR35j169qMg+qkIgAYA3vjMsJVL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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