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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99f8240fa20588ad17db08e30f003ea2aeb6087cc839c5725a6ac1437143c34e' 
  AND token = '8nPg2WQiHUCRoczKSyK1Ir20rfn6AVCDsYoLCVwfkPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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