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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5584af20bbe0a1c9bd374ed9316b2f1a7aeb76f7b3b0cde55a0fa6744837befa' 
  AND token = 'AaZZ+FbkjgnF/fTm6OGD2HtjmNK1ljLfXCDrkhzb740=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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