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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01cfe16f29ecbc66e46f72c8c493ac9ce421d386f1e7c89acb7e48e35e8b117f' 
  AND token = 'AvTTRX91tsEGworjimzYDajCC/JBfP71yx+r08CPHqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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