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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '35432e762ea265a6fe6ad5cb1b46c2c50536cf5fb93f637cc6837db7acd9d0de' 
  AND token = 'v/+v7oyX1VzdiC63djIKc0lcivoxYt57Mo4+UlzsYIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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