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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba3fd66bd9b566f76763313e0afc43d2fcad31fdba6ac3023c449ab1ff21168b' 
  AND token = 'Ju3PjkpTNXOmB7xrEDu2X+gSKkZzVjX7+EnwUzfcolo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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