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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '21cfdc60e4fb87c1efe557f501e00f714225639e9e5e0cedf6ede55986acbc2f' 
  AND token = 'F7iURMNVW/0x8zg6wM62sfqrSJ2pOf5xCzxttv51aJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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