Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93de4000c5e4ef708530631c49a857873c2ea49afb293481ddf397fde6949fa9' 
  AND token = 'mPQO9bkszu+mG8GKDnxRi0uA3prqlGzCoQD8vvUJPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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