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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24139d25424cc89af8c70f7bcb11bc5bd874e9e485506f4d0acbb4140edfff5e' 
  AND token = '0aXGvP+p3cDAlpCRwN27OBC1EW/jmM2yx/uoUHy1DF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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