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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2302de9d81245100b9e972effbb85ce32fd5823afa52bce50b39faf023fabaab' 
  AND token = '4k8kwjYHG83IzC0bqM1F6XI2SmcGloaQm7Z7KUqckrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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