Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074b35f3201f602af674f4fba09b2dbebc7bb8eec53e4011ba8dd22f1ca2c292' 
  AND token = 'Q84l4iglYbuzyRWvf6SSxRo/jobMp8mcP/HkFOi+5Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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