Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a739072d5fd80d19e623e0c7fe5e78378198de16ede2cda3f2fbe8f2746c43' 
  AND token = 'BAVQ67tuoF3GWWldEU8nh75kv88JENvugRICheo9zYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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