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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29cd9eb73e9878a465dda9effdc0ae1c04022ab5f56da80896c7d7687fee8750' 
  AND token = 'GLd3iOjQ6z54NIEa8oymISP3pGcScKcqoFhfzFLWWLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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