Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fb5a2ec54e9dca5b509e0c34c44abaf6ddc1ce9b75db1a25e2a7df99095ed0' 
  AND token = 'ZezB5rpPcL4fx8ev3y6E5PpaWube1Wt75SqvwdXdwBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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