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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f60adbbe1746bedb45b21feb69dce08a672c0a487cf5a5c6e4e83673cec4815' 
  AND token = 'TIuHqjWzb/ueelralOucbMgt6ncDuAzx3htbU7/wAOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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