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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8b18aa09e09bbfcb2c634d651fccb7b3d9f718b4924004d0462d4ca059e5a6f' 
  AND token = 'kcE1DM2MV+akE5pwUygIDZ772NWKoDGcBTAHo4SLmNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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