SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2343d4562095632a5efc54dbbf7dc1c4393fde9a888c4ec3efaf1089028316d' 
  AND token = 'wdClr6TTXYfS5vYb+qd7OiM5QBNVvwu1Tqh9XHsstT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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