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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea27206283bcc2f513c24e2717a68a6e7876ac970ef961bd6d92eb237f59220f' 
  AND token = 'iHu1VxoBhK3REk3y88rVGGAMfDYld7ERHlzbrhwn36w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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