Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a381f3c43706d2e8232825e4177e29f961a8575a809487a0e2da550f434a93' 
  AND token = '2R9wRtoBDQwkGYKlWDhhG2MkKQ7eP22fHszXqRC+oIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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