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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32ba2d2c3a0f3bd02b54b802f5b9c64540a1e13fe0bacdebe56ed716178901c1' 
  AND token = 'SkVmdXbS2dTXaJGLTXPN6BJthbMr73CiNk/UrCvi0OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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