Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310f75b1f026703ed72ba276596572eac28380c0c3eeebc0b8c8f25eae34f600' 
  AND token = 'IsKMRZRldkr+2jFWxzOZkC2KS2A1gDY2vGKumIfaQdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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