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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '322ddbc7b8ab59ffe083f0a8d53c170aeb9cac0c07d3a8c1f616b316b9e0987f' 
  AND token = 'mPpiR6+O0eMWSvSyHoC5ULoMCha4SuVcPuA61idtMgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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