SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '107427c83bf27665e55fd5d97384a213709d4be8a91b813c20d477b8661b477b' 
  AND token = 'fVBCjNDuh5mQf1Godp0+BVDsMFWlyt+L5GKU17YIsvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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