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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b076e10847faab298dbc4636de2fe4416bf9a2dbc88fc7a331a81ee774c3ab6f' 
  AND token = 'AkOxTjd00qBzTeeBo4Ln/HXAcU69WsbwLEuEBrdnt+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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