Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a103bbed3dd59eb2c61e4c3275de8bbc0b19c5bb3ee76927f0df4693039cb73d' 
  AND token = 'ysW2s01hnaA2w2Ef5nKdUZrIZTngqqBHE4mQrAxdXFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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