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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '52fba3de87f10cdfc3ae3174f21a6f156ec665a7e33583a24594f166f7b654e9' 
  AND token = '3pxkie5JWft11+DkRPRf58wTo3VC9JmujG05D9pRz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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