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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32c1212deee4acaa5a7a42738ea401527317e04482cc07a1493650d874dc9d9d' 
  AND token = '8O81IFeZYB/QqDiddx1I/jfkibIuChYsMLbmEAfoB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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