Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3a386e93a5d1d421bc14c5d116278c0d2ee13900f070efedc4c7c569e442a1' 
  AND token = 'lyO3r9ggYNRajRqQ4QJlaWnWYgh+vRRNZiDeuwrMOA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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