SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60224d8382fa89a34db0bcb605dce6ebcaf2a91700929f57996d6e831ca48569' 
  AND token = 'NDwnPtAsw/azRkLPpyQ2cVvuKMACamBdiwrZfRJtylk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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