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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3ea807a6ad825f6ec8716f0e3587592bc162acd34b20388a969304e3932b2399' 
  AND token = '1HRmp1vcz5kXQIO6EftO0OorL64Tp97OELzbCggo/4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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