SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'edc8c76b22f615f67a69a2a38fbed8f60ad553731e70bfffc596a3395170b98e' 
  AND token = 'gxdm1YtqbcURdTHTUvZagZlQcWgDpUY54oTBL1g4rjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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