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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef5fd6dc8d3790652e0f43479770112414ea69f0b06a909bf9b49f7eb39a4c0e' 
  AND token = 'jS0rMtD34cam76rIEYwYA/dkF/s9zMvlw8Dq1lyWFVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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