Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdccf7cdbe2499dbb81d794d749f02db171d6391f6a1c579701c92b12eb1124' 
  AND token = 'RSNVIr91LfoAOwbwoYGTtxHN336AGRnYRk0qjffFW6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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