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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '731a613b37f4d73597cd3602a04572dc90552b158df5533d1b3cecc1832013f7' 
  AND token = 'boe5pnetDq5kXYlLeH06yVcsof/Y18+OBrVCtuawttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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