SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89c3532e41ddc09b2fb21f577bd62ab5849461aaf6b1fc7e1280d47a2a4e7bb0' 
  AND token = 'IlWJ9ADWXQRbfJTpG1OD1/QO9qMJ1zYbodVMEd8S2hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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