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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ba1c2604f731befac77d4f5d5903cbbe67447f560460a826a6d441983844914' 
  AND token = 'Hrx6sLN6QCoDVeOiy5kLUFwOg+Fmgq7O2ItFeyrBMFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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