SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ccdf78d3ab301885e2c1f944e2a56bf9f004e0b3eab45bc1a0479936eb8680ad' 
  AND token = 'fTh1K/xa1pmGppsWuLJM15bzBJJeqky92XjIaH7ZuWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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