SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '122f02b99a0dfc4062bc7cf1e7b880589fac1582d08c4b995533883790d4014e' 
  AND token = 'vXeeLUQlXF2xvSAmpVFq80gCKwU/b0mJxxCmpIrX25M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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