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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1af0df18c8c5e1cc2eb0b7141aca2e8f6330c7dec8e76942b8bdf49c048b4b0b' 
  AND token = 'U7R1bIY8IM88KtLas3mSdPrckMKWs6JDWnyhAHlxXC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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